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Title: | Coulomb interactions and screening effects in few-layer black phosphorus: A tight-binding consideration beyond the longwavelength limit |
Authors: | Prishchenko, D. A. Mazurenko, V. G. Katsnelson, M. I. Rudenko, A. N. |
Issue Date: | 2017 |
Publisher: | IOP Publishing Ltd |
Citation: | Coulomb interactions and screening effects in few-layer black phosphorus: A tight-binding consideration beyond the longwavelength limit / D. A. Prishchenko, V. G. Mazurenko, M. I. Katsnelson, et al. — DOI 10.1088/2053-1583/aa676b // 2D Materials. — 2017. — Vol. 4. — Iss. 2. — 025064. |
Abstract: | Coulomb interaction and its screening play an important role in many physical phenomena of materials ranging from optical properties to many-body effects including superconductivity. Here, we report on a systematic study of dielectric screening in few-layer black phosphorus (BP), a twodimensional material with promising electronic and optical characteristics. We use a combination of a tight-binding model and rigorously determined bare Coulomb interactions, which allows us to consider relevant microscopic effects beyond the long-wavelength limit. We calculate the dielectric function of few-layer BP in the random phase approximation and show that it exhibits strongly anisotropic behavior even in the static limit. We also estimate the strength of effective local and non-local Coulomb interactions and determine their doping dependence. We find that the pz states responsible for low-energy excitations in BP provide a moderate contribution to the screening, weakening the on-site Coulomb interaction by less that a factor of two. Finally, we calculate the full plasmon spectrum of few-layer BP and discuss the effects beyond long-wavelengths. © 2017 IOP Publishing Ltd. |
Keywords: | BLACK PHOSPHORUS COULOMB INTERACTION DIELECTRIC SCREENING PLASMONS TIGHT-BINDING MODEL APPROXIMATION ALGORITHMS BINDING ENERGY OPTICAL PROPERTIES PHOSPHORUS PLASMONS ANISOTROPIC BEHAVIORS DIELECTRIC SCREENING LONG-WAVELENGTH LIMITS LOW-ENERGY EXCITATIONS OPTICAL CHARACTERISTICS RANDOM PHASE APPROXIMATIONS TIGHT BINDING MODEL TWO-DIMENSIONAL MATERIALS COULOMB INTERACTIONS |
URI: | http://elar.urfu.ru/handle/10995/102114 |
Access: | info:eu-repo/semantics/openAccess |
SCOPUS ID: | 85021274004 |
WOS ID: | 000398424400011 |
PURE ID: | 1760242 |
ISSN: | 20531583 |
DOI: | 10.1088/2053-1583/aa676b |
Appears in Collections: | Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC |
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